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#ifdef X11
#include <stdio.h>
#include <time.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xcomposite.h>
#include <X11/extensions/Xfixes.h>
#include <X11/extensions/shape.h>
#include <cairo.h>
#include <cairo-xlib.h>
Display *d;
Window overlay;
Window root;
int width, height;
void allow_input_passthrough(Window w)
{
XserverRegion region = XFixesCreateRegion(d, NULL, 0);
XFixesSetWindowShapeRegion(d, w, ShapeBounding, 0, 0, 0);
XFixesSetWindowShapeRegion(d, w, ShapeInput, 0, 0, region);
XFixesDestroyRegion(d, region);
}
void prep_overlay(void)
{
overlay = XCompositeGetOverlayWindow(d, root);
allow_input_passthrough(overlay);
}
void draw(cairo_t *cr)
{
int quarter_w = width / 4;
int quarter_h = height / 4;
cairo_set_source_rgb(cr, 1.0, 0.0, 0.0);
cairo_rectangle(cr, quarter_w, quarter_h, quarter_w * 2, quarter_h * 2);
cairo_fill(cr);
}
int main()
{
printf("X11\n");
struct timespec ts = { 0, 5000 };
d = XOpenDisplay(NULL);
int s = DefaultScreen(d);
root = RootWindow(d, s);
XCompositeRedirectSubwindows(d, root, CompositeRedirectAutomatic);
XSelectInput(d, root, SubstructureNotifyMask);
width = DisplayWidth(d, s);
height = DisplayHeight(d, s);
prep_overlay();
cairo_surface_t *surf = cairo_xlib_surface_create(d, overlay, DefaultVisual(d, s), width, height);
cairo_t *cr = cairo_create(surf);
XSelectInput(d, overlay, ExposureMask);
XEvent ev;
while (1) {
overlay = XCompositeGetOverlayWindow(d, root);
draw(cr);
XCompositeReleaseOverlayWindow(d, root);
nanosleep(&ts, NULL);
}
cairo_destroy(cr);
cairo_surface_destroy(surf);
XCloseDisplay(d);
return 0;
}
#endif
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